Table A-7 lists critical values for limited choices of a. Use Table A-1 to add a new column in Table A-7 (from n = 1 to n = 8) that represents a significance level of 0.03 in one tail or 0.06 in two tails. For any particular n, use p = 0.5, because the sign test requires the assumption that P(positive sign) = P(negative sign) = 0.5. The probability of x or fewer like signs is the sum of the probabilities for values up to and including x.

Table A-1:

Table A-3: